1. Department of Mathematics, College of Science Hohai University Nanjing China
2. College of Engineering Mechanics Hohai University Nanjing China
3. CONACyT‐Tecnológico Nacional de México/CENIDET Interior Internado Palmira S/N, Col. Cuernavaca México
4. Department of Mathematics Shaheed Benazir Bhutto University Khyber Pakhtunkhwa Pakistan
5. Department of Mathematics and General Sciences Prince Sultan University Riyadh Saudi Arabia